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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9db97260447b1bce5dbddf41d9fb5e338a8ac5bd54d216b4dc60baaa631d5843' 
  AND token = 'PgRwVtkcgBOS49kxYu39dseJc39Rk2sBTKKw632fPvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}